H1C Compressor Wheel?

[HRajagopal]

Bought a rebuildable turbo from a forum member, turbo was in good shape and buildable. Once rebuilt and installed, boost only makes about 10psi (16cm aftermarket housing, '92 Intercooled CTD)



Bad turbo with rubbing compressor wheel and turbine made 12 psi before I pulled it out.



The wheel on the "new" turbo was pretty dinged up, so should I try another stock wheel? Or a larger wheel and housing (to the tune of $200!)



Maybe I need to look at something else (pump is "mildly" tuned), 3" exhaust.



Anyone been through this?

 

[JLEONARD]

The wheel on the "new" turbo was pretty dinged up, so should I try another stock wheel? Or a larger wheel and housing (to the tune of $200!)

I don't like the sounds of it being "dinged up". That would bother me and probably prevent me from installing it at all.

Also who rebuilt it? Balance is important and could prevent it from spooling properly as well.

My opinion... go with a new wheel and housing... . and send the turbo to HTT (or whomever) and let them install the wheel and balance it.

(FWIW I just installed a used turbo on mine and it pumps out over 30 psi no problem)

Jay

 

[HRajagopal]

30psi? Not out of an H1C????



As far as balancing, the compressor wheels are shipped already balanced (independently), so the only thing HTT would do is what most (not all of course) could do; torque on the new wheel, machine the back plate and install the housing.

 

[swankmetal]

they actually will do a good job of balancing the thing as a whole. you'd be surprised. i put the wheel in and machined my own housing, but when i get a chance to, i WILL have it rebalanced. and yes, 30 psi out of an h1c is pretty easy, especially if you have a larger wheel. i can get mine up to 40psi, and only have 47-48psi of drive pressure. pretty good if ya ask me. if you don't have access to a lathe, the 200 bucks will be well spent. IMHO.



dave

 

[HRajagopal]

they actually will do a good job of balancing the thing as a whole. you'd be surprised. i put the wheel in and machined my own housing, but when i get a chance to, i WILL have it rebalanced. and yes, 30 psi out of an h1c is pretty easy, especially if you have a larger wheel. i can get mine up to 40psi, and only have 47-48psi of drive pressure. pretty good if ya ask me. if you don't have access to a lathe, the 200 bucks will be well spent. IMHO.



dave

OK, so 30psi with another wheel/housing, that I can understand.



I do have a lathe at home and access to a larger precision lathe, but they claim the "58" wheel/comp housing doesn't need any mods to work on a stock cartridge. Any larger and you do need to machine the baseplate. Question is, should I go for it and get the largest I can and machine the plate and assy it, or just get the 58 wheel and housing, install it and hope I get more than 10psi boost??

 

[swankmetal]

go big!!!!! the backing plate is a super easy machine job. i would maybe check your system for leaks first though. are you intercooled? what year? what kind of "mild tweaks"? i could squeeze 35+ psi out of my stocker. not very efficient, but it would do it.



dave

 

[Philip]

If you set that turbo up on the tight side that will cause low boost also. It will need time to break in some.



I would check for some leaks in the system.

 

[JLEONARD]

OK, so 30psi with another wheel/housing, that I can understand

I was getting over 30 with my stock "baby H1C" also which has a lot smaller wheel. Turn up the fuel a little and you'll get the boost.



Yes machining the backing plate is easy. You are only making the existing pocket a larger diameter. HTT sends the instructions along with the wheel.

 

[bgilbert]

LOL 30 psi out of a H1C!!!!!! C'mon now, stock my baby 3" h1c did that! Injectors and turned up pump, I got 40psi out of it, with a 18. 5cm turbine housing, go smaller than that and you get more out of one.